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TROUBLESHOOTING
SYMPTOM
Low permeate flow rate
(continued)
Low concentrate flow rate,
normal or higher than normal
pressure
POSSIBLE CAUSES
Operating on cold water less
than 13°C (55°F)
Membrane elements installed
backward or damaged concen-
trate seal
Concentrate valve plugged
Concentrate outline line
restricted
Flow meter inaccurate
Dirty concentrate valve
REMEDIES
Install a hot/cold feed water
tempering valve if more per-
meate flow is needed.
Operate with a feed water
temperature of 22° - 25°C
(72° -77°F).
Install membrane elements in
the direction of fluid flow.
Flush and clean the machine
immediately
. Membrane ele-
ments with damaged seals
should be cleaned and may be
returned for repair.
Remove the concentrate valve
and/or disassemble the
plumbing. Clean the valve.
Examine the concentrate line
for obstructions or kinks,
repair or replace the tubing.
Check the flow rate manually
with a stopwatch and calibrat-
ed container.
Disassemble and clean the
plumbing to the valve.